Biology·Organisation & maintenance · NSSCO 3.6.2.3
Digestion
Narrated lesson · press play
How your body breaks big food molecules into small ones it can absorb — the three digestive enzymes and what they make, the job of stomach acid, and how bile helps digest fat.
What you'll learn in this lesson
By the end you should be able to (NSSCO Biology 3.6.2.3):
- State the role of enzymes in digestion and their dependence on pH and temperature
- Describe the functions of amylase, protease and lipase, with substrate and end-products
- State the functions of hydrochloric acid in gastric juice
- Outline the role of bile in neutralising acid and emulsifying fats
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Quick revision
Revise this in 5 minutes
Miss Rachel and Mike talk through the whole topic — with the figure and working drawn live.
Hands-on lab
Investigate how temperature affects a digestive enzyme in 3D